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U-Pb zircon SHRIMP dating of a protracted magmatic setting and its volcanic emplacement

2021-07Journal article Open access
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dc.contributor.authorLains Amaral, João
dc.contributor.authorSolá, A. Rita
dc.contributor.authorSantos, Telmo M. Bento Dos
dc.contributor.authorTassinari, Colombo C. G.
dc.contributor.authorGonçalves, João
dc.date.accessioned2021-06-09T11:26:27Z
dc.date.available2021-06-09T11:26:27Z
dc.date.issued2021-07
dc.descriptionThis is a contribution to the research project PetroGeo (LNEG)pt_PT
dc.description.abstractA geochronological study using SHRIMP U-Pb analysis of zircon grains has been conducted to date felsic volcanic rocks hosting the six massive sulphide deposits of the giant Aljustrel mining district in the Iberian Pyrite Belt. A multiple method age calculation approach was used to validate and ponder calculated Concordia ages (emplacement and inherited), which included weighted average, probability density peak(s), Tuff Zirc and Unmix functions. This approach was particularly useful to interpret the wide continuous single U-Pb ages (320–405 Ma) recorded in the Aljustrel volcanic rocks. The volcanic pile (>250 m) that hosts the Aljustrel deposits was emplaced between 359 and 353 Ma. Upper Devonian inheritance, representing subvolcanic activity, is well-represented in the volcanic rocks of Aljustrel (373–365 Ma). Older Devonian inherited zircon ages at 405 Ma, 388 Ma and 380 Ma were retrieved, hypothetically representing deep plutonism or other melting episodes, which suggests a long-lasting (~50 Ma) magmatic activity in the Aljustrel district. Older pre-Devonian inherited ages, uppermost Silurian and early to late Cambrian, and post-emplacement ages (~330–345 Ma) were also detected, with the latter reflecting Pb loss most likely driven by the main Variscan orogenic event. Maximum ages obtained for the volcanic rocks in the different deposits open the possibility that the last pulses of volcanic activity and subsequent deposition of the massive sulphides were diachronic in the different Aljustrel sub-basins. Additionally, results imply that, contrary to previously assumed, Gavião and São João-Moinho deposits are probably not the same ore lens disrupted by tardi-Variscan faults. This opens new opportunities for mining exploration and targeting in the Aljustrel district and points out the importance of high-resolution geochronological studies in mining and brownfield areas.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.doihttps://doi.org/10.1016/j.oregeorev.2021.104147pt_PT
dc.identifier.issn0169-1368
dc.identifier.urihttp://hdl.handle.net/10400.9/3559
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.publisherElsevierpt_PT
dc.relationFCT - PhD grant SFRH/BD/138791/2018pt_PT
dc.relationIDL – Instituto Dom Luiz - UIDB/50019/2020pt_PT
dc.relation.publisherversionhttps://www.sciencedirect.com/science/article/pii/S0169136821001724#!pt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectIberian Pyrite Beltpt_PT
dc.subjectVHMS depositspt_PT
dc.subjectZircon U–Pb geochronologypt_PT
dc.subjectFelsic volcanic rockspt_PT
dc.subjectProlonged magmatic activitypt_PT
dc.titleU-Pb zircon SHRIMP dating of a protracted magmatic setting and its volcanic emplacementpt_PT
dc.title.alternativeInsights from the felsic volcanic rocks hosting the sulphide ore of the giant Aljustrel deposit, Iberian Pyrite Beltpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.titleOre Geology Reviewspt_PT
oaire.citation.volume134pt_PT
person.familyNameLains Amaral
person.familyNameSolá
person.familyNameBento dos Santos
person.givenNameJoão
person.givenNameA. Rita
person.givenNameTelmo
person.identifier.ciencia-id4713-7D9F-6567
person.identifier.ciencia-idFB13-8A5C-1DBA
person.identifier.orcid0000-0001-8269-8470
person.identifier.orcid0000-0001-9567-5470
person.identifier.orcid0000-0003-4589-0222
person.identifier.ridG-6378-2015
person.identifier.ridF-8075-2012
person.identifier.scopus-author-id36093841900
rcaap.rightsopenAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication5899c256-b194-4fb8-8b10-6fda401169ab
relation.isAuthorOfPublication96d92535-8625-449c-b580-01e42baaa59c
relation.isAuthorOfPublication10c0e85f-6986-4b3c-ace8-22d70651da40
relation.isAuthorOfPublication.latestForDiscovery96d92535-8625-449c-b580-01e42baaa59c

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